of basel



Patented Sept. 27, 1932 RQBERT EALLEB, F BIEHEN, NEAR BASED, AND .ALPHONSE HEGKENDOBN, 0E BASEL, SWITZERLAND, ASSIGNORS TO THE FIRM OF SOCIETY 01' CHEMICAL INDUSTRY IN BASLE, 0F BASEL, SWITZERLAND TEXTILE CONTAINING ALLYL ETHERS O1 CELLULOSE AND PROCESS OF MAKING sum Ito Drawing. Application filed October 26, 1829, Serial No. 402,788, and in Switzerland November 8, 1828.

According to the present invention, the dyeing properties of the textiles from cellulose are changed, with retention of the origiy nal structure and strength of the fiber,

first converting them into alkali cellulose by treatment with caustic alkali, and then treating this material with allyl halides in such a medium that dissolution of the ether produced cannot occur. The process may con- 1 sist in treating alkali cellulose with the allylating agent in gaseous or vaporous form, or in presence of an indifferent solvent. The treatment of the cellulose with the caustic aland with the allylating agent may be combined in a single operation. As allylating agents there come into consideration allyl bromide, allyl chloride, etc.

The new textile material thus obtained can show a more or less strongly pronounced immunity to the so-called direct dyeing dyestufls or to vat-dyestuffs, but may be characterized by strong allinity for the basic dyestufis or for the generally feebly basic insoluble dyestuffs which are used for acetyl cellulose. As compared with the materials immunized by means of strong acids the new material shows an enhanced durability when stored, that is to say, should hydrolysis occur for any reason, the fiber is not in dan er of being converted into hydroxycellulose y action of the products of hydrolysis.

The following examples illustrate the invention Example 1 excess of caustic soda so ution is, drained away. i

The skein pretreater either as described under (a) or as described under (6) is rapidly nature of the allylating agent.

wetted with allyl bromide and then suspended in a tube (the stretched skein remaining in this condition) through which a current of allyl bromide vapor is circulated, heat being applied .by paming steam througha wider tube surrounding the first tube. After two or three hours the alkali cellulose has been converted, which may be recognized owing to the fact that the skein no longerrenders alkaline hot water with which it is washed. The skein is then rinsed, soaped hot, and dried. The yarn thus obtained which shows a considerable increase in weight, is as strong as untreated material, and hasno aflinity for direct dyeing or vat-dyestuffs. However, it canflbe dyed with insoluble acetate silk dyestu s.

1f allyl chloride is to be substituted for allyl bromide, it is recommendable to work under pressure, and to impregnate with an alcoholic caustic potash solution.

Ewample 2% In a solution of about 5-7 per cent. strength of allyl bromide in an indifferent solvent, such as is for example obtained by mixin 70 parts of allyl bromide and 1000 parts 0 carbon tetrachloride, there are introduced 10 parts of cotton in the form of yarn which has been wetted in hot water and pressed, and while strongly stirring, parts of canstic soda solution of 20 per cent. strength are dropped in while the solution is being heated to boiling in a reflux apparatus on the water bath. The solution, which is at first turbid, becomes gradually clear, while on the surface of the liquid there collects some unconsumed caustic soda solution and water. After 24 hours the yarn is washed, soaped, and dried. The yarn thus obtained possesses properties which are similar to those of Example 1.

In like manner, the process may be applied to other materials, suitable media for the reaction being selected in accordance with the Example 3 Cotton is impregnated in an alcoholic caustic potash solution of 15 per cent. strength. The solution in excess is then removed by hydroextracting. The material thus pretreated is heated for about 2 hours on the boiling water bath in a solution of for example 20-30 parts of allyl bromide in 270 parts of xylene. After rinsing and drying the ma.- terial is best Washed yet in hot soap water whereby the adhering smell of allyl bromide is completely removed. The cotton thus obtained is characterized by a. pronounced immuflity to direct dyeing, sulfur and vat-dyestu s.

The fiber thus obtained has no longer any aflinity to direct dyeing and vat-dyestuffs, but it can be dyed with acetate silk dyestuffs.

What we claim is 1. Process for the manufacture of textiles containing allyl ethers of cellulose which retain the original structure and strength of the fiber, consisting in treating textiles from cellulose which have been pretreated with solutions of caustic alkalies, with allyl halides selected from the group consisting of allyl bromide and allyl chloride.

2. Process for the manufacture of textiles containing allyl ethers of cellulose which retain the original structure and strengthof the fiber, consisting in treating textiles from cellulose in the presence of indifferent solvents with aqueous caustic alkalies and allyl halides selected from the group consisting of allyl bromide and allyl chloride.

3. Process for the manufacture of textiles containing allyl ethers of cellulose which retain the original structure and strength of the fiber, consisting in treating textiles from cellulose in the presence of indiiferent solvents with aqueous caustic alkalies and allyl bromide.

4. As a new product of manufacture the new textile material containing allyl ethers of cellulose which product is insoluble in water and organic solvents, has retained the original structure and strength of the cellulose material employed, has affinity for the insoluble acetate silk dyestuffs, and is immune to the direct dyeing and vat-dyestuffs.

In witness whereof we have hereunto signed our names this 17th day of October, 1929.

' ROBERT HALLER.

A LPHONSE HECKENDORN. 

